Add 12/21 and 20/7
1st number: 12/21, 2nd number: 2 6/7
12/21 + 20/7 is 24/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
12/21 = 12 × 1/21 × 1 = 12/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
20/7 = 20 × 3/7 × 3 = 60/21 - Add the two like fractions:
12/21 + 60/21 = 12 + 60/21 = 72/21 - 72/21 simplified gives 24/7
- So, 12/21 + 20/7 = 24/7
In mixed form: 33/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+20/7 12/21+40/7 12/42+20/7 12/21+20/14 36/21+20/7 12/21+60/7 12/63+20/7 12/21+20/21 60/21+20/7 12/21+20/35 84/21+20/7 12/21+20/49